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For those reasons, there's been lots of interest in the education world in studying the sleep habits of children and adolescents. But until now, most sleep studies have been limited to short-term surveys with small numbers of participants.

That's changing with the advent of wearable activity trackers. These devices include an accelerometer that detects movement and tries to decide whether you are running, sitting or sleeping. They can't directly measure whether people are asleep, so experts say they're not as accurate as hooking someone up to machines in a lab.